Material testing machine



FIG. 1 is a perspective view of a material testing machine showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The portions of the material testing machine shown in solid lines and the black appearance thereof are part of the claimed design. The dashed broken lines illustrate portions of the material testing machine and form no part of the claimed design. 

CLAIM The ornamental design for a material testing machine, as shown and described. 